5 * Texas Instruments, <www.ti.com>
7 * Aneesh V <aneesh@ti.com> for OMAP4
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 #include <asm/arch/sys_proto.h>
31 #include <asm/utils.h>
33 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
34 #define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
35 static u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
36 static u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
39 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
40 /* Base AC Timing values specified by JESD209-2 for 532MHz operation */
41 static const struct lpddr2_ac_timings timings_jedec_532_mhz = {
42 .max_freq = 532000000,
65 * Min tCK values specified by JESD209-2
66 * Min tCK specifies the minimum duration of some AC timing parameters in terms
67 * of the number of cycles. If the calculated number of cycles based on the
68 * absolute time value is less than the min tCK value, min tCK value should
69 * be used instead. This typically happens at low frequencies.
71 static const struct lpddr2_min_tck min_tck_jedec = {
86 static const struct lpddr2_ac_timings const*
87 jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
88 &timings_jedec_532_mhz
91 static const struct lpddr2_device_timings jedec_default_timings = {
92 .ac_timings = jedec_ac_timings,
93 .min_tck = &min_tck_jedec
96 void emif_get_device_timings(u32 emif_nr,
97 const struct lpddr2_device_timings **cs0_device_timings,
98 const struct lpddr2_device_timings **cs1_device_timings)
100 /* Assume Identical devices on EMIF1 & EMIF2 */
101 *cs0_device_timings = &jedec_default_timings;
102 *cs1_device_timings = NULL;
104 #endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */